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Yamaha 225 Temp Alarm in Idle

Old 07-01-2009, 10:47 AM
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Default Yamaha 225 Temp Alarm in Idle

If anyone has any input on what might be causing this problem I would really appreciate it. The temp alarm on one of my yamaha 225 4-strokes (year 2005) occassionally goes off. I say occassionally because it usually runs fine during the first half of the day. I can go out trolling for hours, and its not until I return, when I have the boat in gear at 600 rpm down a long canal that the temp alarm goes off. The boat is peeing fine. When I first start my day, the temp bars increase and stabilize on both engines almost simultaneously. Any thoughts?
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Old 07-01-2009, 10:55 AM
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Check your poppet valve. Have you replaced your water pump?
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Old 07-01-2009, 10:55 AM
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I had the same problem last year with 250 ox-66. The alarm would go off but I was still pumping out water about the same tempature as the other engine..I replaced the thermostats and the problem was solved..
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Old 07-01-2009, 11:23 AM
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Ecod,
Had the same problem last week with one of my 2004 F225's. Alarm only went off after using the boat a while and only when at idle. I had my mechanic replace water pumps on each engine (about $69 each) and problem was solved. My theory is the engine was fine at speed but the worn pump couldn't work efficiently at idle.
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Old 07-01-2009, 11:32 AM
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Try the thermostats and water pump first, I am having my boat serviced at my local dealer right now and he was describing the problem you are having could be a corroded exhaust tube which is common in these motors and requires the motor powerhead to be pulled! he said another symptom could be a miss in mid to upper rpm ranges, he wanted to repair my exhaust tube along with my leaky oil pump for a cool $5,000
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Old 07-01-2009, 01:27 PM
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Wow! I really appreciate everyone's help with this. I just joined the forum today and can't believe how responsive everyone has been.

I paid for a 200 hour service so the impellers should have been changed, but I don't necessarily trust the shop that did it. I don't think this particular engine has a poppet valve but I may be wrong. I've since had a mechanic come out to the house and change starboard side t-stat, but I am still having the problem. I guess my next step is change the other t-stat and then the impeller.

Thanks to everyone for the insight.
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Old 07-01-2009, 01:36 PM
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rybovich18 - thanks for your response. Despite the problem having been your water pump, did your water pressure appear adequate to the naked eye?
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Old 07-01-2009, 05:14 PM
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Originally Posted by waynesworld View Post
Try the thermostats and water pump first, I am having my boat serviced at my local dealer right now and he was describing the problem you are having could be a corroded exhaust tube which is common in these motors and requires the motor powerhead to be pulled! he said another symptom could be a miss in mid to upper rpm ranges, he wanted to repair my exhaust tube along with my leaky oil pump for a cool $5,000
The exhaust tube issue is well known to Yamaha. My neighbor down the canal had to replace two out of three on his 33 Hydra Sport. Motors had less than 300 hrs.! Yamaha replaced them under warranty but due to a shortage of the mid-sections it took almost 4 months.

I hope this is not what is wrong with your motor, try the other fixes first but keep this issue in mind, the symptoms are the same as what he was experiencing.
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Old 07-01-2009, 05:35 PM
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I am a Five Star Yamaha Certified technician. It is the water pump impeller. It will shoot water fine out of the tell tale because the veins on the impeller are not worn enough to stop it from pumping. This sounds like an impeller that has been through the normal wear cycle. Change it. You will solve the problem.
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Old 07-01-2009, 06:31 PM
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I am not a mechanic but I replaced my tstats and water pump this spring and then ran into the same problem you are having. Changed the poppet valve and now all is well.
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Old 07-01-2009, 06:36 PM
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Overheating at dead idle can be a number of things and most were mentioned in the previous posts. Don't overlook a temp sensor problem either.
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Old 07-02-2009, 07:35 AM
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Ecod,
My pressure seemed just fine - both motors were peeing. And, when he did change the pumps out the old ones looked a little worn, but not too bad. I would listen to davis1 and try pumps first.
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Old 07-02-2009, 07:50 AM
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Thanks guys. Will try pumps first and cross my fingers that it is not the exhaust tube.
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Old 07-02-2009, 01:10 PM
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Had same issue with a 2 stroke. Changed water pump. No help. Changed T stats. No help. Changed poppet valve. Fixed.
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Old 07-02-2009, 01:46 PM
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Check poppit valve. You must first take off both side leg covers, then the rear cover located just below the main cowling. Once in there you remove a small bolt and keeper which is supposed to keep the poppit valve from rotating but the thing is in there so tight it would never move anyway. It's a plastic piece with a large hex head perhaps as big as 1 and a half inches. Carefully unscrew it its only about 2 inces long take it out and blow it out with somthing to clear the holes. Their really isn't much to the thing it's spring loaded and I feel it can be reused as long as you don't strip it. Good luck....
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Old 07-02-2009, 05:02 PM
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If it were me I'd change the poppet valve first. Not only is it cheaper than the other fixes mentioned here but it's also by far the easiest to change out and will take no more than 30 minutes.
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Old 07-02-2009, 05:09 PM
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Originally Posted by seahorse View Post
Overheating at dead idle can be a number of things and most were mentioned in the previous posts. Don't overlook a temp sensor problem either.
That would be a "switch".......wouldn't it?

Just bustin your chops Seahorse.

If the WP is fresh along with the t-stats, I would bet Firefly's money on the poppet valve.

Here is a link to what they look like on your engine.... http://www.simyamaha.com/VALVE_p/69j-11371-00-00.htm

Andy
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Old 07-02-2009, 05:41 PM
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Originally Posted by SIM View Post

That would be a "switch".......wouldn't it?

Just bustin your chops Seahorse.

Tomatoe - Tomahtoe !!!!!!!!!!
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Old 07-02-2009, 05:57 PM
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I have the same motor,same problem,thermostats fixed it,left side stuck 3/4 closed
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Old 07-06-2009, 11:57 AM
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Can't get over how helpful this forum is....it rocks!
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